package com.github.scribejava.apis.examples;

import com.github.scribejava.apis.TheThingsNetworkV1StagingApi;
import com.github.scribejava.core.builder.ServiceBuilder;
import com.github.scribejava.core.model.OAuth2AccessToken;
import com.github.scribejava.core.model.OAuthRequest;
import com.github.scribejava.core.model.Response;
import com.github.scribejava.core.model.Verb;
import com.github.scribejava.core.oauth.OAuth20Service;

import java.io.IOException;
import java.net.URLDecoder;
import java.util.Random;
import java.util.Scanner;
import java.util.concurrent.ExecutionException;

public class TheThingsNetworkV1StagingExample {

    private static final String NETWORK_NAME = "TTNv1staging";
    private static final String PROTECTED_RESOURCE_URL = "https://account.thethingsnetwork.org/applications";

    private TheThingsNetworkV1StagingExample() {
    }

    @SuppressWarnings("PMD.SystemPrintln")
    public static void main(String... args) throws IOException, InterruptedException, ExecutionException {
        // Replace these with your client id and secret
        final String clientId = "your_client_id";
        final String clientSecret = "your_client_secret";
        final String secretState = "secret" + new Random().nextInt(999_999);
        final String redirectURI = "https://your_redirect_uri";

        final OAuth20Service service = new ServiceBuilder(clientId)
                .apiSecret(clientSecret)
                .callback(redirectURI)
                .build(TheThingsNetworkV1StagingApi.instance());
        final Scanner in = new Scanner(System.in, "UTF-8");

        System.out.println("=== " + NETWORK_NAME + "'s OAuth Workflow ===");
        System.out.println();

        // Obtain the Authorization URL
        System.out.println("Fetching the Authorization URL...");
        final String authorizationUrl = service.getAuthorizationUrl(secretState);
        System.out.println("Got the Authorization URL!");
        System.out.println("Now go and authorize ScribeJava here:");
        System.out.println(authorizationUrl);
        System.out.println("And paste the authorization code here");
        System.out.print(">>");

        // TTN v1staging does not have URL safe keys, so we have to decode it
        final String code = URLDecoder.decode(in.nextLine(), "UTF-8");
        System.out.println("Using code: " + code);
        System.out.println();

        System.out.println("And paste the state from server here. We have set 'secretState'='" + secretState + "'.");
        System.out.print(">>");
        final String value = in.nextLine();
        if (secretState.equals(value)) {
            System.out.println("State value does match!");
        } else {
            System.out.println("Oops, state value does not match!");
            System.out.println("Expected = " + secretState);
            System.out.println("Got      = " + value);
            System.out.println();
        }

        // Trade the Request Token and Verifier for the Access Token
        System.out.println("Trading the Request Token for an Access Token...");
        final OAuth2AccessToken accessToken = service.getAccessToken(code);
        System.out.println("Got the Access Token!");
        System.out.println("(The raw response looks like this: " + accessToken.getRawResponse() + "')");
        System.out.println();

        // Now let's go and ask for a protected resource!
        System.out.println("Now we're going to access a protected resource...");
        final OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL);

        service.signRequest(accessToken, request);
        request.addHeader("Accept", "application/json");
        try (Response response = service.execute(request)) {
            System.out.println("Got it! Lets see what we found...");
            System.out.println();
            System.out.println(response.getCode());

            if (response.getCode() == 401) {
                System.out.println("Not authorised: " + response.getBody());
            } else {
                System.out.println("You should see a JSON array of your registered applications:");
                System.out.println(response.getBody());

                System.out.println();
                System.out.println("That's it man! Go and build something awesome with ScribeJava! :)");
            }
        }
    }
}
